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标题: 022、STC12C5A60S2单片机之串口通信单主单从 [打印本页]

作者: 张衍波 时间: 2015-5-5 16:55
标题: 022、STC12C5A60S2单片机之串口通信单主单从
/********************************************************************
                        汇诚科技

实现功能:STC12C5A60S2单片机之串口通信单主单从
使用芯片：STC12C5A60S2
晶振：11.0592MHZ
波特率：115200
编译环境：Keil
作者：zhangxinchun
网站：www.ourhc.cn
淘宝店：
汇诚科技 http://ourhc.taobao.com
郑兴电子直销部 http://shop68451856.taobao.com
【声明】此程序仅用于学习与参考，引用请注明版权和作者信息！

*********************************************************************/
#include "REG52.H"
#include "INTRINS.H"

#define FOSC       18432000L
#define BAUD       (256 - FOSC / 32 / 115200)

typedef unsigned char BYTE;
typedef unsigned int WORD;
typedef unsigned long DWORD;

sfr  AUXR    = 0x8e;    //Auxiliary register

sfr SPSTAT    = 0xcd;    //SPI status register
#define SPIF       0x80       //SPSTAT.7
#define WCOL       0x40       //SPSTAT.6
sfr SPCTL    = 0xce;    //SPI control register
#define SSIG       0x80       //SPCTL.7
#define SPEN       0x40       //SPCTL.6
#define DORD       0x20       //SPCTL.5
#define MSTR       0x10       //SPCTL.4
#define CPOL       0x08       //SPCTL.3
#define CPHA       0x04       //SPCTL.2
#define SPDHH    0x00       //CPU_CLK/4
#define SPDH       0x01       //CPU_CLK/16
#define SPDL       0x02       //CPU_CLK/64
#define SPDLL    0x03       //CPU_CLK/128
sfr SPDAT    = 0xcf;    //SPI data register
sbit SPISS    = P1^3;    //SPI slave select, connect to slave' SS(P1.4) pin

void InitUart();
void InitSPI();
void SendUart(BYTE dat);       //send data to PC
BYTE RecvUart();             //receive data from PC
BYTE SPISwap(BYTE dat);       //swap SPI data between master and slave

///////////////////////////////////////////////////////////

void main()
{
InitUart();                //initial UART
InitSPI();                //initial SPI

while (1)
{
#ifdef MASTER                //for master (receive UART data from PC and send it to slave, in the meantime
                              //          receive SPI data from slave and send it to PC)
      SendUart(SPISwap(RecvUart()));
#else                         //for salve (receive SPI data from master and
      ACC = SPISwap(ACC);    //          send previous SPI data to master)
#endif
}
}

///////////////////////////////////////////////////////////

void InitUart()
{
SCON = 0x5a;             //set UART mode as 8-bit variable baudrate
TMOD = 0x20;             //timer1 as 8-bit auto reload mode
AUXR = 0x40;             //timer1 work at 1T mode
TH1 = TL1 = BAUD;          //115200 bps
TR1 = 1;
}

///////////////////////////////////////////////////////////

void InitSPI()
{
SPDAT = 0;                //initial SPI data
SPSTAT = SPIF | WCOL;    //clear SPI status
#ifdef MASTER
SPCTL = SPEN | MSTR;       //master mode
#else
SPCTL = SPEN;             //slave mode
#endif
}

///////////////////////////////////////////////////////////

void SendUart(BYTE dat)
{
while (!TI);             //wait pre-data sent
TI = 0;                   //clear TI flag
SBUF = dat;                //send current data
}

///////////////////////////////////////////////////////////

BYTE RecvUart()
{
while (!RI);             //wait receive complete
RI = 0;                   //clear RI flag
return SBUF;             //return receive data
}

///////////////////////////////////////////////////////////

BYTE SPISwap(BYTE dat)
{
#ifdef MASTER
SPISS = 0;                //pull low slave SS
#endif
SPDAT = dat;             //trigger SPI send
while (!(SPSTAT & SPIF)); //wait send complete
SPSTAT = SPIF | WCOL;    //clear SPI status
#ifdef MASTER
SPISS = 1;                //push high slave SS
#endif
return SPDAT;             //return received SPI data
}

/********************************************************************
                           结束
*********************************************************************/

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